#include<stdio.h>

#define M 100
//#define OS 0//0-->windows, 1-->Centos


int main()
{
#if OS
  printf("hello Centos\n");
#else
  printf("hello windows\n");
#endif 
  printf("%d\n", M);
  printf("hello world\n");
  printf("hello world\n");
  printf("hello world\n");
  printf("hello world\n");
  //printf("hello world\n");
  //printf("hello world\n");
  //printf("hello world\n");
  return 0;
}
